Ad esign for an effective molecular luminescent thermometerb ased on long-range electronic coupling in lanthanide coordination polymers is proposed. The coordination polymers are composed of lanthanide ions Eu III and Gd III ,t hree anionic ligands(hexafluoroacetylacetonate), and ac hrysene-based phosphine oxide bridges (6,12-bis(diphenylphosphoryl)chrysene). The zig-zago rientation of the single polymerc hains induces the formation of packed coordination structuresc ontaining multiple sites forC H-F intermolecular interactions, resulting in thermal stability above 350 8C. The electronic coupling is controlledb yc hanging the concentration of the Gd III ion in the Eu III-Gd III polymer.T he emission quantum yield and the maximum relative temperature sensitivity (S m)o fe mission lifetimesf or the Eu III-Gd III polymer (Eu:Gd = 1:1, F tot = 52 %, S m = 3.73 %K À1)w ere higher than those for the pure Eu III coordination polymer (F tot = 36 %, S m = 2.70 %K À1), respectively.E nhanced temperature sensing properties are causedb yc ontrol of long-range electronic coupling based on phosphine oxide with chrysene framework.

Luminescent Eu­(III) complexes with a ligand-to-metal charge transfer (LMCT) state were demonstrated for the development of a molecular thermometer. The Eu­(III) complex was composed of three anionic ligands (hfa: hexafluoroacetylacetonate) and a phosphine oxide derivative containing a chrysene framework (diphenylphosphorylchrysene (DPCO)). The chrysene framework induced a rigid coordination structure via intermolecular interactions, resulting in a high thermal stability (decomposition point: 280 °C). The Eu­(III) complex also exhibited an extremely high molar absorption coefficient (490000 cm–1 M–1), high intrinsic emission quantum yields (73%), and temperature-dependent energy migration between ligands and Eu­(III) ion. The characteristic energy migration system was explained by the presence of the LMCT state based on π–f orbital interactions.

Herein the aggregation-induced emission (AIE) of a Tb(iii) complex is reported for the first time.

Luminescent lanthanide complexes containing effective photosensitizers are promising materials for use in displays and sensors. The photosensitizer design strategy has been studied for developing the lanthanide-based luminophores. Herein, we demonstrate a photosensitizer design using dinuclear luminescent lanthanide complex, which exhibits thermally-assisted photosensitized emission. The lanthanide complex comprised Tb(III) ions, six tetramethylheptanedionates, and phosphine oxide bridge containing a phenanthrene frameworks. The phenanthrene ligand and Tb(III) ions are the energy donor (photosensitizer) and acceptor (emission center) parts, respectively. The energy-donating level of the ligand (lowest excited triplet (T1) level = 19,850 cm−1) is lower than the emitting level of the Tb(III) ion (5D4 level = 20,500 cm−1). The long-lived T1 state of the energy-donating ligands promoted an efficient thermally-assisted photosensitized emission of the Tb(III) acceptor (5D4 level), resulting in a pure-green colored emission with a high photosensitized emission quantum yield (73%).

Herein, the π–f orbital interaction depending on the coordination geometry in the Eu(iii) complex is demonstrated.